This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 32 |
| 5 | 92 |
| 6 | 264 |
| 7 | 772 |
| 8 | 2272 |
| 9 | 6732 |
| 10 | 20024 |
| 11 | 59732 |
| 12 | 178512 |
| 13 | 534172 |
| 14 | 1599784 |
| 15 | 4793892 |
| 16 | 14370752 |
| 17 | 43090412 |
| 18 | 129227544 |
| 19 | 387595252 |
| 20 | 1162610992 |
| 21 | 3487483452 |
| 22 | 10461751304 |
| 23 | 31383855812 |
| 24 | 94148771232 |
| 25 | 282440721292 |
| 26 | 847310979064 |